| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15431
|
Thu Jun 25 15:11:00 2020 |
gautam | Update | SUS | MC1 coil driver resistance quartered | I implemented this change today. We only
had 100 ohm, 3W resistors in stock (no 200
ohm with adequate power rating). Assuming |
|
|
15432
|
Fri Jun 26 11:00:52 2020 |
Jordan | Update | General | Presence at 40m | I will be in the Clean and Bake lab today
from 11am to 4pm. |
|
|
15433
|
Fri Jun 26 16:53:38 2020 |
gautam | Update | Electronics | RFPD characterization | Summary:
While the vacuum system was knocked
out, I measured the RF transimpedance (using |
|
|
15434
|
Sun Jun 28 15:30:52 2020 |
gautam | Update | SUS | MC1 sat-box de-lidded | Judging by the summary
pages, some 18 hours after this
change was made and the board re-installed, |
|
|
15435
|
Sun Jun 28 16:29:58 2020 |
rana | Update | SUS | MC1 sat-box de-lidded | does the FLIR have an option to export
image with a colorbar?
How about just leave the lid open? |
|
|
15436
|
Sun Jun 28 17:36:35 2020 |
gautam | Update | SUS | MC1 sat-box de-lidded | Hmm I can't seem to export with the
colorbar, might be just my phone though.
I tried to add some "cursors" with |
|
|
15437
|
Mon Jun 29 11:41:04 2020 |
Jordan | Update | General | Presence at 40m | I will be in the Clean and Bake lab today
from 11:30am to 4pm |
|
|
15438
|
Mon Jun 29 11:55:46 2020 |
gautam | Update | SUS | MC1 sat-box de-lidded | There was no improvement to the situation
overnight. So, I did the following today:
Ramped bias voltages for |
|
|
15439
|
Mon Jun 29 15:56:02 2020 |
gautam | Update | Electronics | RFPD characterization | A more comprehensive report has been uploaded
here.
I'll zip the data files and add them |
|
|
15440
|
Mon Jun 29 20:30:53 2020 |
Koji | Update | SUS | MC1 sat-box de-lidded | Sigh. Do we have a spare sat box? |
|
|
15441
|
Tue Jun 30 08:50:12 2020 |
Jordan | Update | General | Presence at 40m | I will be in the clean and bake lab today
from 9am to 4pm. |
|
|
15442
|
Tue Jun 30 10:59:16 2020 |
gautam | Update | LSC | Three sensing matrices | Summary:
I injected some sensing lines and
measured their responses in the various photodiodes, |
|
|
15443
|
Tue Jun 30 22:00:04 2020 |
gautam | Update | Electronics | Glitchy POX resurfaces | This
problem reared its ugly head again. I
am inclined to believe the problem is electronic |
|
|
15444
|
Wed Jul 1 08:51:52 2020 |
Jordan | Update | General | Presence at 40m | I will be in the Clean and Bake lab from
9am to 4pm today. |
|
|
15445
|
Wed Jul 1 12:50:40 2020 |
gautam | Update | PEM | MC1 accelerometers plugged in | I re-connected the 3 accelerometers located
near the MC1/MC3 chamber. It was a bit tedious
to get the cabling sorted - I estimate the |
|
|
15447
|
Wed Jul 1 18:16:09 2020 |
gautam | Update | Computers | rossa re-re-revival | In an effort to make a second usable workstation,
I did the following (remotely) on rossa today
(not necessarily in this order, I wasn't |
|
|
15448
|
Thu Jul 2 16:51:23 2020 |
Jordan | Update | General | Bathroom Science | As part of an ongoing effort to improve
airflow in workspaces/bathrooms on campus, |
|
|
15449
|
Sun Jul 5 16:14:41 2020 |
rana | Update | Computers | rossa re-re-revival | maybe we should make a "dd" copy
of pianosa in case rossa has issues
and someone destroys pianosa by accidentally |
|
|
15450
|
Sun Jul 5 18:25:42 2020 |
rana | Update | Electronics | WFS characterization | in the lab, checkin on the WFS
Sun Jul 5 18:25:50 2020
I redid Gautam's measurements |
|
|
15451
|
Sun Jul 5 18:39:57 2020 |
rana | Update | Computers | rossa: printer | I did
sudo usermod -a -G |
|
|
15452
|
Mon Jul 6 00:37:28 2020 |
gautam | Update | Computers | rossa: lib symlink | This is strange - I was definitely able
to launch medm when I was working on this
machine remotely on Friday. But now, there |
|
|
15453
|
Mon Jul 6 08:48:15 2020 |
Jordan | Update | General | Presence at 40m | I will be in the Clean and Bake lab today
from 8:30am to 4pm |
|
|
15454
|
Mon Jul 6 12:43:02 2020 |
rana | Update | Computers | rossa: lib symlink | yes, I rebooted yesterday to fix the 'steaking
white lines' problem in the video/display
maybe we're supposed to edit |
|
|
15455
|
Mon Jul 6 12:51:41 2020 |
gautam | Update | Computers | rossa: resolvconf installed | Indeed, this is now fixed by following
instructions from here.
I rebooted rossa at ~1250 PDT and confirmed |
|
|
15457
|
Mon Jul 6 17:41:19 2020 |
gautam | Update | LSC | An LSC puzzler | Last Tuesday evening, while attempting
the PRFPMI locking, I noticed a strange feature
in the LSC signals, which is shown in |
|
|
15458
|
Tue Jul 7 14:06:10 2020 |
gautam | Update | ASC | Some more thoughts about ASC | Summary:
I want to be able to run the dither
alignment servo with the PRFPMI locked - |
|
|
15459
|
Wed Jul 8 08:51:35 2020 |
Jordan | Update | General | Presence at 40m | I will be in the clean and bake lab today
from 9am to 3pm. |
|
|
15460
|
Wed Jul 8 22:50:33 2020 |
gautam | Update | Computers | rossa: more symlinks | I wanted to try using rossa as my locking
workstation today. However, a few problems
became quickly evident. Basically, any of |
|
|
15461
|
Thu Jul 9 09:22:44 2020 |
Jordan | Update | General | Presence at 40m | I will be in the Clean and Bake lab today
from 9am to 3pm |
|
|
15463
|
Thu Jul 9 16:16:20 2020 |
gautam | Update | Computers | rossa: graphics driver issues? | I noticed these streaky lines again today
(but they were not a problem last night).
It is annoying if we have to reboot this |
|
|
15464
|
Thu Jul 9 17:12:52 2020 |
gautam | Update | BHD | In-air BHD | Summary:
We can probably learn something
about the interferometer / top level BHD |
|
|
15466
|
Fri Jul 10 01:25:28 2020 |
gautam | Update | LSC | Locking notes | More tomorrow, but I tried the following
tonight:
Dither alignment for PRC |
|
|
15467
|
Fri Jul 10 10:37:30 2020 |
Jordan | Update | General | Presence at 40m | I will be in the Clean and Bake lab today
from 9am to 4pm |
|
|
15468
|
Fri Jul 10 15:26:28 2020 |
gautam | Update | LSC | MC2 coils need DC balancing? | I was looking at some signals from last
night, see Attachment |
|
|
15469
|
Sat Jul 11 00:10:22 2020 |
gautam | Update | Computers | rossa: more developmental work | After some consultation with Erik von Reis
at LHO, this workstation is progressing towards
being usable |
|
|
15470
|
Sat Jul 11 18:24:30 2020 |
Koji | Update | LSC | MC2 coils need DC balancing? | > Can't
we offload this DC signal to the laser crystal |
|
|
15471
|
Sun Jul 12 02:42:01 2020 |
gautam | Update | LSC | Locking (on rossa) | Main goals tonight were:
Check if I can lock the
interferometer by working on rossa - indeed, |
|
|
15472
|
Sun Jul 12 22:40:35 2020 |
gautam | Update | Electronics | WFS characterization - old SURF report | After some hunting, I found this
old SURF report with the WFS head measurements.
The y-axes don't make much sense to me, |
|
|
15473
|
Mon Jul 13 11:33:18 2020 |
rana | Update | Computers | rossa: more developmental work | I too, would prefer py3 for everything,
but aren't all the cdsutils / gaurdian
things still python2? |
|
|
15474
|
Mon Jul 13 11:36:08 2020 |
rana | Update | LSC | MC2 coils need DC balancing? |
if IMC REFL is not increasing,
I don't think its a mis-alignment. Usually,
REFL is a more sensitive indicator of alignment |
|
|
15475
|
Mon Jul 13 12:37:05 2020 |
gautam | Update | Computers | rossa: more developmental work | In fact, all these utilities are now available
in python3. There may be some bugs (e.g.
this), |
|
|
15476
|
Tue Jul 14 00:06:09 2020 |
gautam | Update | LSC | Locking with POX for CARM | I tried using the POX_I error signal for
the DC CARM_B path today a couple of times.
Got to a point where the AO path could be |
|
|
15477
|
Tue Jul 14 01:55:03 2020 |
Koji | Update | LSC | Locking with POX for CARM | The usual technique is that keeping the
IFO locked with the old set of the signals
and the relative gain/TF between the conventional |
|
|
15478
|
Tue Jul 14 09:04:53 2020 |
Jordan | Update | General | Presence at 40m | I will be in the Clean and Bake Lab today
from 9am to 4pm. |
|
|
15479
|
Tue Jul 14 15:29:25 2020 |
gautam | Update | BHD | In-air BHD - DCPD amplifier noise | For the first pass, it's probably easiest
to use the existing DCPD
amplifier. Looking at the gain and noise |
|
|
15480
|
Tue Jul 14 16:52:47 2020 |
gautam | Update | Electronics | Coil drivers for the test masses | Summary:
Koji and I had a discussion last
Friday about the suspension electronics. |
|
|
15481
|
Tue Jul 14 17:28:29 2020 |
gautam | Update | LSC | Locking with POX for CARM | From Attachment
#1, looks like the |
|
|
15483
|
Wed Jul 15 19:11:40 2020 |
gautam | Update | BHD | In-air BHD - alignment into OMC | I forgot about the pointing - probably
we will need another actuator to control
the pointing of the AS beam onto the DCPDs. |
|
|
Draft
|
Wed Jul 15 19:17:09 2020 |
gautam | Update | BHD | In-air BHD - alignment into OMC | You can activate all 3axis
|
|
|
15485
|
Wed Jul 15 19:23:44 2020 |
gautam | Update | General | Emergency light on in control room | The emergency lamps above the exit sign
on the NW entrance to the control room are
on. I tried opening and closing the door, |
|